If device is attached to port multiplier, the detection process
look like this:
ahci_hardreset(link, class, deadline)
if (class == ATA_DEV_PMP) {
sata_pmp_attach(dev) /* will enable FBS */
sata_pmp_init_links(ap, nr_ports);
ata_for_each_link(link, ap, EDGE) {
sata_std_hardreset(link, class, deadline);
if (link_is_online)
ahci_softreset(link, class, deadline);
}
}
But, according to chapter 9.3.9 in AHCI spec: Prior to issuing software reset,
software shall clear PxCMD.ST to '0' and then clear PxFBS.EN to '0'.
Signed-off-by: Xiangliang Yu <yxlraid@xxxxxxxxx>
---
drivers/ata/libahci.c | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index acfd0f7..8d024a4 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1267,9 +1267,11 @@ int ahci_do_softreset(struct ata_link *link, unsigned int *class,
{
struct ata_port *ap = link->ap;
struct ahci_host_priv *hpriv = ap->host->private_data;
+ struct ahci_port_priv *pp = ap->private_data;
const char *reason = NULL;
unsigned long now, msecs;
struct ata_taskfile tf;
+ bool flag = FALSE;
int rc;
DPRINTK("ENTER\n");
@@ -1279,6 +1281,11 @@ int ahci_do_softreset(struct ata_link *link, unsigned int *class,
if (rc && rc != -EOPNOTSUPP)
ata_link_warn(link, "failed to reset engine (errno=%d)\n", rc);
+ if (!ata_is_host_link(link) && pp->fbs_enabled) {
+ ahci_disable_fbs(ap);
+ flag = TRUE;
+ }
+
ata_tf_init(link->device, &tf);
/* issue the first D2H Register FIS */
@@ -1319,6 +1326,9 @@ int ahci_do_softreset(struct ata_link *link, unsigned int *class,
} else
*class = ahci_dev_classify(ap);
+ if (flag)
+ ahci_enable_fbs(ap);
+
DPRINTK("EXIT, class=%u\n", *class);
return 0;
--
1.7.1
--
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